.header {
            text-align: center;
            padding: 40px 20px;
            background: linear-gradient(135deg, #182737 0%, #182737 100%);
            color: white;
        }

        .logo {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 15px;
            margin-bottom: 15px;
        }

        .logo-icon {
            font-size: 48px;
            font-weight: bold;
        }

        h1 {
            font-size: 42px;
            font-weight: 700;
        }

        h1 .formatter {
            color: #ffd700;
        }

        .subtitle {
            font-size: 16px;
            opacity: 0.95;
            margin-top: 10px;
        }

        .main-content {
            padding: 30px;
        }

        .tabs {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .tab {
            padding: 10px 20px;
            border: 2px solid #e0e0e0;
            background: white;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s;
        }

        .tab:hover {
            border-color: #182737;
            color: #182737;
        }

        .tab.active {
            background: #182737;
            color: white;
            border-color: #182737;
        }

        .editor-container {
            border: 2px solid #e0e0e0;
            border-radius: 12px;
            overflow: hidden;
            margin-bottom: 20px;
        }

        textarea {
            width: 100%;
            min-height: 400px;
            padding: 20px;
            font-family: 'Courier New', Courier, monospace;
            font-size: 14px;
            border: none;
            outline: none;
            resize: vertical;
            background: #f8f9fa;
        }

        .controls {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
            align-items: center;
        }

        .btn {
            padding: 12px 24px;
            border: none;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
        }

        .btn-primary {
            background: #ff5722;
            color: white;
        }

        .btn-primary:hover {
            background: #e64a19;
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(255, 87, 34, 0.4);
        }

        .btn-secondary {
            background: white;
            color: #333;
            border: 2px solid #e0e0e0;
        }

        .btn-secondary:hover {
            border-color: #182737;
            color: #182737;
            transform: translateY(-2px);
        }

        .tab-size-control {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .tab-size-control input {
            width: 60px;
            padding: 10px;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            font-size: 14px;
            text-align: center;
        }

        .info-section {
            padding: 30px;
            background: #f8f9fa;
        }

        .info-section h2 {
            color: #333;
            margin-bottom: 15px;
            font-size: 24px;
        }

        .info-section p {
            color: #666;
            line-height: 1.8;
            margin-bottom: 15px;
        }

        .privacy-note {
            text-align: center;
            padding: 20px;
            color: #999;
            font-size: 14px;
            font-style: italic;
        }

        .file-input {
            display: none;
        }

        @media (max-width: 768px) {
            .controls {
                flex-direction: column;
                align-items: stretch;
            }

            .btn {
                justify-content: center;
            }
        }